[microtonal]

I use Snap on one small project, it is pretty awesome. Snap applications have the terseness and simplicity of, say Sinatra or Rails, but with type checking. As is often the case in Haskell, if your program compiles it is usually correct.

What I also like about Snap (and Yesod) is that it is integrated well with the enumerator package. Simply said, the enumerator package allows you to implement composable data sources, manipulators, and sinks. Since many web applications consist of extracting data from a source, manipulating, and sending it, it allows you to write applications short and simple.